Have you checked in Retrovol (rt/clk tray volume icon, ->'Full window') to see what level your PCM setting is at? This is what controls overall sound output through ALSA, and is often set at '0' in new installs.

Retrovol (rt/clk tray volume icon, ->'Full window')
Also, there is a adjuster for the headphones.
Turn them off/on
Adjust volume.

multiple soundcard wizard
You may still need to go back to it and make sure you actually have the correct device selected to provide audio.

Some of the devices, that could be listed, are not what provides audio to the audio plugs on the computer._________________I have found, in trying to help people, that the things they do not tell you, are usually the clue to solving the problem.
When I was a kid I wanted to be older.... This is not what I expected

There has been a few people who mentioned having this problem before. I think one was scientist, who managed to solve it. Using the search and plugging in "65295" gave me 17 results, maybe there is more posts too with a different 65*** number.

Are you using a very new version of Firefox browser?_________________I have found, in trying to help people, that the things they do not tell you, are usually the clue to solving the problem.
When I was a kid I wanted to be older.... This is not what I expected

(/initrd/mnt/dev_save/firefox/firefox:20397): GLib-GObject-CRITICAL **: g_object_unref: assertion 'object->ref_count > 0' failed
1502011835245 addons.update-checker WARN Update manifest for firefox@getpocket.com did not contain an updates property
1502011835250 addons.update-checker WARN Update manifest for followonsearch@mozilla.com did not contain an updates property
1502011835287 addons.update-checker WARN Update manifest for aushelper@mozilla.org did not contain an updates property
1502011835306 addons.update-checker WARN Update manifest for webcompat@mozilla.org did not contain an updates property
1502011835310 addons.update-checker WARN Update manifest for {972ce4c6-7e08-4474-a285-3208198ce6fd} did not contain an updates property
1502011835418 addons.update-checker WARN Update manifest for e10srollout@mozilla.org did not contain an updates property
[GFX1-]: ClientLayerManager::BeginTransaction with IPC channel down. GPU process may have died.
[GFX1-]: ClientLayerManager::BeginTransaction with IPC channel down. GPU process may have died.
[apulse] [error] do_connect_pcm: failed to open ALSA device. Apulse does no resampling or format conversion, leaving that task to ALSA plugins. Ensure that selected device is capable of playing a particular sample format at a particular rate. They have to be supported by either hardware directly, or by "plug" and "dmix" ALSA plugins which will perform required conversions on CPU.

The newest versions of Firefox need PulseAudio, but you do not need to install PulseAudio in Puppy.

There is a pet package that you download and install.
It will put the needed PulseAudio files in Puppy, so Firefox is happy.

Pet package is here:
Fix audio in Firefox 52 without having to install PulseAudio.
http://www.murga-linux.com/puppy/viewtopic.php?p=947398#947398_________________I have found, in trying to help people, that the things they do not tell you, are usually the clue to solving the problem.
When I was a kid I wanted to be older.... This is not what I expected

UN-install the 32bit pet before installing the 64bit one.!!_________________I have found, in trying to help people, that the things they do not tell you, are usually the clue to solving the problem.
When I was a kid I wanted to be older.... This is not what I expected

OH!
I'd seen the word PulseAudio before, but knew essentially nothing about it.
So after glancing through this thread, I did a quick search, and saw
https://unix.stackexchange.com/questions/249342/why-do-you-need-pulseaudio
On that page, someone said "..If you want to be able to play audio from two sources at once, ever, for any reason, you need multiplexing."
As a simple user, it had never occurred to me to play audio from more than one source.
For years, I used Lucid Puppy. Lately I use Tahr. And browse with Iron.

Thanks guys.
I now have a browser where I can hear what 's happening in videos. It's Pale Moon and its the one that ships with tahrpup64. I have given Firefox the heave-ho.
A bit sad really about browsers. Chrome interferes with printer settings and Firefox has no sound. I suppose I could try Opera

Did you ever try the correct PulseAudio pet to fix Firefox?_________________I have found, in trying to help people, that the things they do not tell you, are usually the clue to solving the problem.
When I was a kid I wanted to be older.... This is not what I expected

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